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While additive manufacturing has existed for decades in one form or another, until recently, its scope was largely restricted to prototyping and commercial use. Now, however, thanks to advancements in the technology, 3D printing is finally beginning its steady march into our homes, with two key players controlling around 40% of the consumer market.

A familiar nameThe first company -- and likely the most recognizable given its publicly traded status -- is 3D Systems , which unveiled its Cube home 3D printers early last year. In the company's most recent earnings call, however, management warned investors not to expect sales from the consumer segment to significantly contribute to the company's overall revenue anytime soon. In the meantime, 3D Systems is happy to ride a wave of rapidly increased adoption with the rest of its products after witnessing year-over-year revenue growth of 57%, to a record $90.5 million during its most recent quarter.

An up-and-comerThe second key player in the consumer 3D printing market is privately held MakerBot, founded in 2009, and responsible for the popular Replicator series printers. Interestingly, MakerBot was also the recipient of $10 million in venture capital funding in 2011 and, though the bulk of the money came from Foundry Group, Amazon.com CEO Jeff Bezos' private firm, Bezos Expeditions, was among its list of financiers.

Though MakerBot is notoriously tight-lipped about revenue, according to the consulting firm Wohlers Associates, the company sold around 5,000 units in 2011 -- an increase of 150% from 2,000 printers in 2010 -- and with prices at the time ranging from $1,100 to $2000 per unit, we can estimate MakerBot's 2011 revenue at just under $8 million by averaging the two extremes. While that may look small at first glance, it still represents an impressive 250% increase over the previous year. Further still, just a few months ago, a MakerBot spokeswoman stated sales for the company's new line of Replicator 2 printers have "totally exceeded" expectations, signaling even better days ahead for the young start-up.

May the best company winGiven the recent acquisition binge in the 3D printing industry, I'm amazed that a larger company like 3D Systems hasn't stepped forward to swallow MakerBot before it becomes an even bigger threat. Still, 3D Systems' management has previously asserted that each of its acquisitions serves a specific purpose, whether to absorb a revenue-generating business, or to simply build R&D know-how, with no immediate sales benefit. In addition, like MakerBot with its Replicator 2 printers, 3D Systems' management has also recently voiced excitement for the segment, as its Cube printer unit sales have consistently exceeded expectations. With this in mind, maybe 3D Systems simply has no interest in buying MakerBot's potentially redundant technology, and would instead prefer to compete the good-old fashioned way.

On that note, 3D Systems' traditionally industrial-centric competitor Stratasys could also benefit by acquiring MakerBot. Unfortunately, given the relative youth of the consumer 3D printing market, Stratasys has remained reluctant to enter the space.

To its credit, while I admit Stratasys currently seems to be doing just fine, the company likely still has its hands full working out the details of last years' whale of a merger with Israel-based Objet.Perhaps,unsurprisingly then, the words "consumer" and "home" were used a grand total of zero times during Stratasys' most recent earnings conference call.

Even still, the consumer market remains in its infancy, and Stratasys may have plenty of time to jump in. When the rubber hits the road, however, and the home-based 3D printing really takes off, if Stratasys doesn't do something quickly, it may find itself late to the game, and scrambling to compete with the better-established offerings of its peers.

If you thought same day shipping was good...Last but not least, if not 3D Systems or Stratasys -- and that's a very big "if" -- I wouldn't be surprised if a ground-breaking company like Amazon bought MakerBot. For starters, we already know Jeff Bezos has shown interest through his 2011 investment in the company. We also know that Amazon isn't afraid of making strategic acquisitions in the name of streamlining operations, most notably with its $775 million purchase of Kiva Systems last year for its fleet of fun-to-watch, warehouse-optimizing robots.

Besides, how great would it be for consumers to wield the ability to buy something on Amazon.com and simply print it out at home? No packing. No shipping. Just a downloadable digital model to send over to your trusty 3D desktop printer. Sure, this kind of workflow is a long way off, but Bezos isn't exactly known for managing Amazon with a short-term mindset.

Life altering, mind boggling profitsIn the end, I'm convinced all three of the above-mentioned companies would be better off owning this young business. In any case, while it remains to be seen whether MakerBot will survive these early stages of its life intact, investors should know that there's plenty of money to be made in the consumer 3D printing market.

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Editor's note: A previous version of this story misstated the percentage increase in the number of MakerBot units sold from 2010 to 2011. The Motley Fool regrets the error.

Fool contributor Steve Symington has no position in any stocks mentioned. The Motley Fool recommends 3D Systems, Amazon.com, and Stratasys. The Motley Fool owns shares of 3D Systems, Amazon.com, and Stratasys and has the following options: Short Jan 2014 $55 Calls on 3D Systems and Short Jan 2014 $30 Puts on 3D Systems. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.